The Tcpdump Group git mirrors - tcpdump/blob - print-bootp.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Format and print bootp packets.
  22  */
  23 #ifndef lint
  24 static const char rcsid[] =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.47 1999-10-17 23:35:47 mcr Exp $ (LBL)";
  26 #endif
  27
  28 #include <sys/param.h>
  29 #include <sys/time.h>
  30 #include <sys/socket.h>
  31
  32 #if __STDC__
  33 struct mbuf;
  34 struct rtentry;
  35 #endif
  36 #include <net/if.h>
  37
  38 #include <netinet/in.h>
  39 #include <netinet/if_ether.h>
  40
  41 #include <ctype.h>
  42 #ifdef HAVE_MEMORY_H
  43 #include <memory.h>
  44 #endif
  45 #include <stdio.h>
  46 #include <string.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50 #include "bootp.h"
  51
  52 static void rfc1048_print(const u_char *, u_int);
  53 static void cmu_print(const u_char *, u_int);
  54
  55 static char tstr[] = " [|bootp]";
  56
  57 /*
  58  * Print bootp requests
  59  */
  60 void
  61 bootp_print(register const u_char *cp, u_int length,
  62             u_short sport, u_short dport)
  63 {
  64         register const struct bootp *bp;
  65         static u_char vm_cmu[4] = VM_CMU;
  66         static u_char vm_rfc1048[4] = VM_RFC1048;
  67
  68         bp = (struct bootp *)cp;
  69         TCHECK(bp->bp_op);
  70         switch (bp->bp_op) {
  71
  72         case BOOTREQUEST:
  73                 /* Usually, a request goes from a client to a server */
  74                 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
  75                         printf(" (request)");
  76                 break;
  77
  78         case BOOTREPLY:
  79                 /* Usually, a reply goes from a server to a client */
  80                 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
  81                         printf(" (reply)");
  82                 break;
  83
  84         default:
  85                 printf(" bootp-#%d", bp->bp_op);
  86         }
  87
  88         TCHECK(bp->bp_secs);
  89
  90         /* The usual hardware address type is 1 (10Mb Ethernet) */
  91         if (bp->bp_htype != 1)
  92                 printf(" htype-#%d", bp->bp_htype);
  93
  94         /* The usual length for 10Mb Ethernet address is 6 bytes */
  95         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  96                 printf(" hlen:%d", bp->bp_hlen);
  97
  98         /* Only print interesting fields */
  99         if (bp->bp_hops)
 100                 printf(" hops:%d", bp->bp_hops);
 101         if (bp->bp_xid)
 102                 printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid));
 103         if (bp->bp_secs)
 104                 printf(" secs:%d", ntohs(bp->bp_secs));
 105         if (bp->bp_flags)
 106                 printf(" flags:0x%x", ntohs(bp->bp_flags));
 107
 108         /* Client's ip address */
 109         TCHECK(bp->bp_ciaddr);
 110         if (bp->bp_ciaddr.s_addr)
 111                 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
 112
 113         /* 'your' ip address (bootp client) */
 114         TCHECK(bp->bp_yiaddr);
 115         if (bp->bp_yiaddr.s_addr)
 116                 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
 117
 118         /* Server's ip address */
 119         TCHECK(bp->bp_siaddr);
 120         if (bp->bp_siaddr.s_addr)
 121                 printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
 122
 123         /* Gateway's ip address */
 124         TCHECK(bp->bp_giaddr);
 125         if (bp->bp_giaddr.s_addr)
 126                 printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
 127
 128         /* Client's Ethernet address */
 129         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 130                 register const struct ether_header *eh;
 131                 register const char *e;
 132
 133                 TCHECK2(bp->bp_chaddr[0], 6);
 134                 eh = (struct ether_header *)packetp;
 135                 if (bp->bp_op == BOOTREQUEST)
 136                         e = (const char *)ESRC(eh);
 137                 else if (bp->bp_op == BOOTREPLY)
 138                         e = (const char *)EDST(eh);
 139                 else
 140                         e = 0;
 141                 if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0)
 142                         printf(" ether %s", etheraddr_string(bp->bp_chaddr));
 143         }
 144
 145         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 146         if (*bp->bp_sname) {
 147                 printf(" sname \"");
 148                 if (fn_print(bp->bp_sname, snapend)) {
 149                         putchar('"');
 150                         fputs(tstr + 1, stdout);
 151                         return;
 152                 }
 153                 putchar('"');
 154         }
 155         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 156         if (*bp->bp_file) {
 157                 printf(" file \"");
 158                 if (fn_print(bp->bp_file, snapend)) {
 159                         putchar('"');
 160                         fputs(tstr + 1, stdout);
 161                         return;
 162                 }
 163                 putchar('"');
 164         }
 165
 166         /* Decode the vendor buffer */
 167         TCHECK(bp->bp_vend[0]);
 168         length -= sizeof(*bp) - sizeof(bp->bp_vend);
 169         if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048,
 170                  sizeof(u_int32_t)) == 0)
 171                 rfc1048_print(bp->bp_vend, length);
 172         else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu,
 173                       sizeof(u_int32_t)) == 0)
 174                 cmu_print(bp->bp_vend, length);
 175         else {
 176                 u_int32_t ul;
 177
 178                 memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul));
 179                 if (ul != 0)
 180                         printf("vend-#0x%x", ul);
 181         }
 182
 183         return;
 184 trunc:
 185         fputs(tstr, stdout);
 186 }
 187
 188 /* The first character specifies the format to print */
 189 static struct tok tag2str[] = {
 190 /* RFC1048 tags */
 191         { TAG_PAD,              " PAD" },
 192         { TAG_SUBNET_MASK,      "iSM" },        /* subnet mask (RFC950) */
 193         { TAG_TIME_OFFSET,      "lTZ" },        /* seconds from UTC */
 194         { TAG_GATEWAY,          "iDG" },        /* default gateway */
 195         { TAG_TIME_SERVER,      "iTS" },        /* time servers (RFC868) */
 196         { TAG_NAME_SERVER,      "iIEN" },       /* IEN name servers (IEN116) */
 197         { TAG_DOMAIN_SERVER,    "iNS" },        /* domain name (RFC1035) */
 198         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 199         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 200         { TAG_LPR_SERVER,       "iLPR" },       /* lpr server (RFC1179) */
 201         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 202         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 203         { TAG_HOSTNAME,         "aHN" },        /* ascii hostname */
 204         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 205         { TAG_END,              " END" },
 206 /* RFC1497 tags */
 207         { TAG_DUMPPATH,         "aDP" },
 208         { TAG_DOMAINNAME,       "aDN" },
 209         { TAG_SWAP_SERVER,      "iSS" },
 210         { TAG_ROOTPATH,         "aRP" },
 211         { TAG_EXTPATH,          "aEP" },
 212 /* RFC2132 tags */
 213         { TAG_IP_FORWARD,       "BIPF" },
 214         { TAG_NL_SRCRT,         "BSRT" },
 215         { TAG_PFILTERS,         "pPF" },
 216         { TAG_REASS_SIZE,       "sRSZ" },
 217         { TAG_DEF_TTL,          "bTTL" },
 218         { TAG_MTU_TIMEOUT,      "lMA" },
 219         { TAG_MTU_TABLE,        "sMT" },
 220         { TAG_INT_MTU,          "sMTU" },
 221         { TAG_LOCAL_SUBNETS,    "BLSN" },
 222         { TAG_BROAD_ADDR,       "iBR" },
 223         { TAG_DO_MASK_DISC,     "BMD" },
 224         { TAG_SUPPLY_MASK,      "BMS" },
 225         { TAG_DO_RDISC,         "BRD" },
 226         { TAG_RTR_SOL_ADDR,     "iRSA" },
 227         { TAG_STATIC_ROUTE,     "pSR" },
 228         { TAG_USE_TRAILERS,     "BUT" },
 229         { TAG_ARP_TIMEOUT,      "lAT" },
 230         { TAG_ETH_ENCAP,        "BIE" },
 231         { TAG_TCP_TTL,          "bTT" },
 232         { TAG_TCP_KEEPALIVE,    "lKI" },
 233         { TAG_KEEPALIVE_GO,     "BKG" },
 234         { TAG_NIS_DOMAIN,       "aYD" },
 235         { TAG_NIS_SERVERS,      "iYS" },
 236         { TAG_NTP_SERVERS,      "iNTP" },
 237         { TAG_VENDOR_OPTS,      "bVO" },
 238         { TAG_NETBIOS_NS,       "iWNS" },
 239         { TAG_NETBIOS_DDS,      "iWDD" },
 240         { TAG_NETBIOS_NODE,     "bWNT" },
 241         { TAG_NETBIOS_SCOPE,    "aWSC" },
 242         { TAG_XWIN_FS,          "iXFS" },
 243         { TAG_XWIN_DM,          "iXDM" },
 244         { TAG_NIS_P_DOMAIN,     "sN+D" },
 245         { TAG_NIS_P_SERVERS,    "iN+S" },
 246         { TAG_MOBILE_HOME,      "iMH" },
 247         { TAG_SMPT_SERVER,      "iSMTP" },
 248         { TAG_POP3_SERVER,      "iPOP3" },
 249         { TAG_NNTP_SERVER,      "iNNTP" },
 250         { TAG_WWW_SERVER,       "iWWW" },
 251         { TAG_FINGER_SERVER,    "iFG" },
 252         { TAG_IRC_SERVER,       "iIRC" },
 253         { TAG_STREETTALK_SRVR,  "iSTS" },
 254         { TAG_STREETTALK_STDA,  "iSTDA" },
 255         { TAG_REQUESTED_IP,     "iRQ" },
 256         { TAG_IP_LEASE,         "lLT" },
 257         { TAG_OPT_OVERLOAD,     "bOO" },
 258         { TAG_TFTP_SERVER,      "aTFTP" },
 259         { TAG_BOOTFILENAME,     "aBF" },
 260         { TAG_DHCP_MESSAGE,     " DHCP" },
 261         { TAG_SERVER_ID,        "iSID" },
 262         { TAG_PARM_REQUEST,     "bPR" },
 263         { TAG_MESSAGE,          "aMSG" },
 264         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 265         { TAG_RENEWAL_TIME,     "lRN" },
 266         { TAG_REBIND_TIME,      "lRB" },
 267         { TAG_VENDOR_CLASS,     "bVC" },
 268         { TAG_CLIENT_ID,        "bCID" },
 269         { 0,                    NULL }
 270 };
 271
 272 static void
 273 rfc1048_print(register const u_char *bp, register u_int length)
 274 {
 275         register u_char tag;
 276         register u_int len, size;
 277         register const char *cp;
 278         register char c;
 279         int first;
 280         u_int32_t ul;
 281         u_short us;
 282
 283         printf(" vend-rfc1048");
 284
 285         /* Step over magic cookie */
 286         bp += sizeof(int32_t);
 287
 288         /* Loop while we there is a tag left in the buffer */
 289         while (bp + 1 < snapend) {
 290                 tag = *bp++;
 291                 if (tag == TAG_PAD)
 292                         continue;
 293                 if (tag == TAG_END)
 294                         return;
 295                 cp = tok2str(tag2str, "?T%d", tag);
 296                 c = *cp++;
 297                 printf(" %s:", cp);
 298
 299                 /* Get the length; check for truncation */
 300                 if (bp + 1 >= snapend) {
 301                         fputs(tstr, stdout);
 302                         return;
 303                 }
 304                 len = *bp++;
 305                 if (bp + len >= snapend) {
 306                         fputs(tstr, stdout);
 307                         return;
 308                 }
 309
 310                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 311                         c = *bp++;
 312                         switch (c) {
 313                         case DHCPDISCOVER:      printf("DISCOVER");     break;
 314                         case DHCPOFFER:         printf("OFFER");        break;
 315                         case DHCPREQUEST:       printf("REQUEST");      break;
 316                         case DHCPDECLINE:       printf("DECLINE");      break;
 317                         case DHCPACK:           printf("ACK");          break;
 318                         case DHCPNAK:           printf("NACK");         break;
 319                         case DHCPRELEASE:       printf("RELEASE");      break;
 320                         case DHCPINFORM:        printf("INFORM");       break;
 321                         default:                printf("%u", c);        break;
 322                         }
 323                         continue;
 324                 }
 325
 326                 if (tag == TAG_PARM_REQUEST) {
 327                         first = 1;
 328                         while (len-- > 0) {
 329                                 c = *bp++;
 330                                 cp = tok2str(tag2str, "?%d", c);
 331                                 if (!first)
 332                                         putchar('+');
 333                                 printf("%s", cp + 1);
 334                                 first = 0;
 335                         }
 336                         continue;
 337                 }
 338
 339                 /* Print data */
 340                 size = len;
 341                 if (c == '?') {
 342                         /* Base default formats for unknown tags on data size */
 343                         if (size & 1)
 344                                 c = 'b';
 345                         else if (size & 2)
 346                                 c = 's';
 347                         else
 348                                 c = 'l';
 349                 }
 350                 first = 1;
 351                 switch (c) {
 352
 353                 case 'a':
 354                         /* ascii strings */
 355                         putchar('"');
 356                         (void)fn_printn(bp, size, NULL);
 357                         putchar('"');
 358                         bp += size;
 359                         size = 0;
 360                         break;
 361
 362                 case 'i':
 363                 case 'l':
 364                         /* ip addresses/32-bit words */
 365                         while (size >= sizeof(ul)) {
 366                                 if (!first)
 367                                         putchar(',');
 368                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 369                                 if (c == 'i')
 370                                         printf("%s", ipaddr_string(&ul));
 371                                 else
 372                                         printf("%u", ul);
 373                                 bp += sizeof(ul);
 374                                 size -= sizeof(ul);
 375                                 first = 0;
 376                         }
 377                         break;
 378
 379                 case 'p':
 380                         /* IP address pairs */
 381                         while (size >= 2*sizeof(ul)) {
 382                                 if (!first)
 383                                         putchar(',');
 384                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 385                                 printf("(%s:", ipaddr_string(&ul));
 386                                 bp += sizeof(ul);
 387                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 388                                 printf("%s)", ipaddr_string(&ul));
 389                                 bp += sizeof(ul);
 390                                 size -= 2*sizeof(ul);
 391                                 first = 0;
 392                         }
 393                         break;
 394
 395                 case 's':
 396                         /* shorts */
 397                         while (size >= sizeof(us)) {
 398                                 if (!first)
 399                                         putchar(',');
 400                                 memcpy((char *)&us, (char *)bp, sizeof(us));
 401                                 printf("%d", us);
 402                                 bp += sizeof(us);
 403                                 size -= sizeof(us);
 404                                 first = 0;
 405                         }
 406                         break;
 407
 408                 case 'B':
 409                         /* boolean */
 410                         while (size > 0) {
 411                                 if (!first)
 412                                         putchar(',');
 413                                 switch (*bp) {
 414                                 case 0:
 415                                         putchar('N');
 416                                         break;
 417                                 case 1:
 418                                         putchar('Y');
 419                                         break;
 420                                 default:
 421                                         printf("%d?", *bp);
 422                                         break;
 423                                 }
 424                                 ++bp;
 425                                 --size;
 426                                 first = 0;
 427                         }
 428                         break;
 429
 430                 case 'b':
 431                 default:
 432                         /* Bytes */
 433                         while (size > 0) {
 434                                 if (!first)
 435                                         putchar('.');
 436                                 printf("%d", *bp);
 437                                 ++bp;
 438                                 --size;
 439                                 first = 0;
 440                         }
 441                         break;
 442                 }
 443                 /* Data left over? */
 444                 if (size)
 445                         printf("[len %d]", len);
 446         }
 447 }
 448
 449 static void
 450 cmu_print(register const u_char *bp, register u_int length)
 451 {
 452         register const struct cmu_vend *cmu;
 453         char *fmt = " %s:%s";
 454
 455 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 456     if (cmu->m.s_addr != 0) \
 457         printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); }
 458
 459         printf(" vend-cmu");
 460         cmu = (struct cmu_vend *)bp;
 461
 462         /* Only print if there are unknown bits */
 463         TCHECK(cmu->v_flags);
 464         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 465                 printf(" F:0x%x", cmu->v_flags);
 466         PRINTCMUADDR(v_dgate, "DG");
 467         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 468         PRINTCMUADDR(v_dns1, "NS1");
 469         PRINTCMUADDR(v_dns2, "NS2");
 470         PRINTCMUADDR(v_ins1, "IEN1");
 471         PRINTCMUADDR(v_ins2, "IEN2");
 472         PRINTCMUADDR(v_ts1, "TS1");
 473         PRINTCMUADDR(v_ts2, "TS2");
 474         return;
 475
 476 trunc:
 477         fputs(tstr, stdout);
 478 #undef PRINTCMUADDR
 479 }